Abstract
Background
The role of additional androgen deprivation therapy (ADT) in prostate cancer (PCa) patients treated with combined HDR brachytherapy (HDR-BT) and external beam radiotherapy (EBRT) is still unknown.
Patients and methods
Consecutive PCa patients classified as D’Amico intermediate and high-risk who underwent HDR-BT and EBRT treatment ± ADT at our institution between January 1999 and February 2009 were assessed. Multivariable Cox regression models predicting biochemical recurrence (BCR) were performed. BCR-free survival was assessed with Kaplan–Meier analyses.
Results
Overall, 392 patients were assessable. Of these, 221 (56.4 %) underwent trimodality (HDR-BT and EBRT and ADT) and 171 (43.6 %) bimodality (HDR-BT and EBRT) treatment. Additional ADT administration reduced the risk of BCR (HR: 0.4, 95 % CI: 0.3–0.7, p < 0.001). D’Amico high-risk patients had superior BCR-free survival when additional ADT was administered (log-rank p < 0.001). No significant difference for BCR-free survival was recorded when additional ADT was administered to D’Amico intermediate-risk patients (log-rank p = 0.2).
Conclusions
Additional ADT administration improves biochemical control in D’Amico high-risk patients when HDR-BT and EBRT are combined. Physicians should consider the oncological benefit of ADT administration for these patients during the decision-making process.
Zusammenfassung
Hintergrund
Der Nutzen einer zusätzlichen Hormonentzugstherapie (ADT, „androgen deprivation therapy“) für Patienten mit Prostatakarzinom (PCa), welche mit einer Kombination aus HDR-Brachytherapie (HDR-BT) und perkutaner Bestrahlung (EBRT) behandelt werden, ist weiterhin ungeklärt.
Methodik
Für diese Studie wurden konsekutive, nach der D’Amico-Risikoklassifizierung in „intermediate“ und „high-risk“ eingeteilte Patienten ausgewählt, die zwischen Januar 1999 und Februar 2009 in unserem Institut eine kombinierte Therapie aus HDR-BT, EBRT ± ADT erhalten haben. Eine multivariable Cox-Regressionsanalyse zur Vorhersage eines biochemischen Rezidivs (BCR) wurde durchgeführt. Zusätzlich wurde mit einer Kaplan-Meier-Analyse das BCR-freie Überleben in Abhängigkeit vom Status der Hormonentzugstherapie untersucht.
Ergebnisse
Insgesamt wurden 221 von 392 Patienten (56,4 %) mit einer 3-fachen (HDR-BT und EBRT und ADT) und 171 (43,6 %) mit einer 2-fachen Therapie (HDR-BT und EBRT) behandelt. Die zusätzliche ADT hat das Risiko für ein BCR reduziert (HR 0,4; 95 %-KI 0,3–0,7; p < 0,001). D’Amico high-risk-Patienten zeigten ein verbessertes BCR-freies Überleben, wenn eine zusätzliche Hormonentzugstherapie durchgeführt wurde (log-rank p < 0,001). Bei D’Amico intermidiate-risk Patienten hatte die zusätzliche ADT keinen signifikanten Einfluss auf das BCR-freie Überleben (log-rank p = 0,2).
Schlussfolgerung
Die zusätzliche ADT führt bei „High-risk“-Patienten, die mit einer Kombination aus HDR-BT und EBRT behandelt werden, zu einem verbesserten BCR-freien Überleben. Der zusätzliche Nutzen einer ADT sollte in diesem Kontext bei der Therapieplanung erwogen werden.
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J. Schiffmann, H. Lesmana, P. Tennstedt, B. Beyer, K. Boehm, V. Platz, D. Tilki, G. Salomon, C. Petersen, A. Krüll, M. Graefen, and R. Schwarz state that there are no conflicts of interest.
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Jonas Schiffmann and Hans Lesmana contributed equally to this manuscript.
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Schiffmann, J., Lesmana, H., Tennstedt, P. et al. Additional androgen deprivation makes the difference. Strahlenther Onkol 191, 330–337 (2015). https://doi.org/10.1007/s00066-014-0794-y
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DOI: https://doi.org/10.1007/s00066-014-0794-y
Keywords
- Androgen deprivation therapy
- Biochemical recurrence
- Brachytherapy
- External beam radiotherapy
- Prostate cancer
Schlüsselwörter
- Androgenentzugstherapie
- Biochemisches Rezidiv
- Brachytherapie
- Externe Strahlentherapie
- Prostatakarzinom